Simulation of buoyancy driven bubbly flow: Established simplifications and open questions

Sokolichin, A.; Eigenberger, Gerhart; Lapin, A. D.

doi:10.1002/aic.10003

Cited by 297 publications

(236 citation statements)

References 71 publications

Supporting

Mentioning

216

Contrasting

Unclassified

Order By: Relevance

“…T h i s f o r c e wa s n eg l e c t e d i n a l l t h e p r ev i o u s simulations in accordance with the observations made by Hunt et al 33) , Thakre and Joshi 2) , Deen et al 5) , and Sokolichin et al 4) . The turbulent dispersion force, derived by Lopez de Bertodano 34) is based on the analogy with molecular movement.…”

Section: Conservation Of Momentumsupporting

confidence: 89%

“…Amongst the such as limited range of applicability of the empirical aforementioned approaches, the two-fluid approach is correlations so developed, difficulty in extrapolating the widely used. Although there are several studies in inferences to other geometries or even scaled-up versions context of turbulent bubbly flows, a large number of of the same equipment, and overall cost and time frame these studies are found on gas-liquid systems (Friberg 1) ; limitations have led to more attention being focused on Thakre and Joshi 2) ; Joshi 3) ; Sokolichin et al 4) ; Deen et numerical approaches such as computational fluid al. 5) ; Dhotre and Joshi 6) ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation of Oil Dispersions in Vertical Pipe Flow

Parvini¹,

Dabir²,

Mohtashami³

2010

J. Jpn. Petrol. Inst.

View full text Add to dashboard Cite

Immiscible liquid dispersions are widely used in chemical process, petroleum industries, polymerization, heterogeneous chemical synthesis, etc. In most of these chemical processes, the rate of inter-phase heat and mass transfer is known to strongly affect the overall performance and depends on the interfacial contact area between the phases. This study at CFD simulations of immiscible liquid dispersion has been performed on a vertical pipe. With specific reference to dispersed liquid-liquid flows, it was seen that the two-fluid approach (Eulerian-Eulerian approach) was extensively used for multiphase modeling, especially when detailed predictions are desirable over a range of holdups in exchange for a reasonable amount of computation power. The results of CFD predictions for water as a continuous and kerosene as a dispersed phase have been compared with the experiments of Farrar and Bruun and Al-Deen and Bruun. These simulations have also been done to understand the effect of various significant forces in turbulent liquid dispersions (drag, lift, turbulent dispersion and added mass). Several expressions for these forces were tested in order to choose the best combination. Further, the problem has been simulated using two different turbulence models. It has been found that lift force is more important than turbulent dispersion and added mass. Inter-phase closure guidelines for liquid-liquid bubbly flows were developed based on simulation results that yielded the best agreement with experimental data.

show abstract

Section: Conservation Of Momentumsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Oil Dispersions in Vertical Pipe Flow

Parvini¹,

Dabir²,

Mohtashami³

2010

J. Jpn. Petrol. Inst.

View full text Add to dashboard Cite

show abstract

“…According to the suggestion made by Sokolichin et al [24], neglecting the lift force can still lead to satisfying results if no clear experimental evidences for its direction and magnitude are available. They also pointed out that the effect of virtual mass force is negligible except for high frequency fluctuations of the slip velocity.…”

Section: (3) Interphase Momentum Exchangementioning

confidence: 99%

Modified airlift reactor with a cross-shaped internal and its hydrodynamic simulation by computational fluid dynamic method

Tao

Feng

et al. 2017

Biotechnology & Biotechnological Equipment

View full text Add to dashboard Cite

(2018) Modified airlift reactor with a cross-shaped internal and its hydrodynamic simulation by computational fluid dynamic method, Biotechnology & Biotechnological Equipment, 32:1, 194-203, DOI: 10.1080/13102818.2017 A modified airlift reactor (ALR) with a cross-shaped internal was developed to achieve beneficial flow conditions for an advantageous biological process. To study the effect of introduced internal on the reactor's hydrodynamics, computational fluid dynamics simulation method was applied to predict the flow characteristics verified with experimental data. The internal introduction into a conventional ALR resulted in increased liquid velocities in the riser and the downcomer for 12% and 16%, respectively, maintaining the superficial gas velocity of 3 cm/s. The internal allowed the total gas holdup slightly decreased for 4.8%, whereas the turbulent kinetic energy in the riser was significantly reduced for 13%. The cross-shaped internal modified the flow structure in the ALR's bottom zone due to, presumably, substitution of non-elastic collisions of liquid micro-lumps moving in counter-current directions with elastic collisions of micro-lumps with the wall of the internal, reducing the energy dissipation at the U-turn of the flow. The internal unified the direction of liquid velocity vectors in the bottom zone bringing an order to the liquid momenta in the flows close to the parallel ones and thus, saving energy in the ALR's operation.

show abstract

“…After the initial instability of the solution, the second order upwind for the momentum and turbulence terms, as well as the Quick scheme for the volume fraction, were utilized to increase the accuracy of the solution. For the time discretization, the first order implicit scheme was used because of the sufficient accuracy of its results in the ALRs (Sokolichin and Eigenberger, 2004).…”

Section: Model Solution Proceduresmentioning

confidence: 99%

Investigation of hydrodynamics and transition regime in an internal loop airlift reactor using CFD

Ghasemi

Hosseini

2012

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-CFD modeling for an internal loop airlift reactor is developed for different superficial gas velocities, ranging from 0.015 to 0.073 m/s. Based on the presence of gas bubbles in the downcomer, three regimes can be generally classified as: no gas bubbles (I), stagnation of gas bubbles (II), and recirculation of gas bubbles into the riser (III). The aim of the study is to carefully investigate the regime transition from II to III by considering the gas distribution. In regime II, the CFD simulation results show that the gas holdup difference between the riser and the downcomer remains constant. Due to the transition from regime II to III, the gas holdup difference sharply increases and the ratio of gas holdup in the downcomer and riser changes between the two regimes. At a superficial gas velocity slightly lower than that of the transitional regime, a small amount of gas is dragged to the riser, while the behavior of the regime is similar to regime II. The computational results show that CFD can be used as an effective tool to provide information on the details of the transition regime in internal loop airlift reactors.

show abstract

Simulation of buoyancy driven bubbly flow: Established simplifications and open questions

Abstract: An assessment is given of the present state of modeling and simulation of buoyancy driven gas-liquid bubble flow based on the two-fluid approach. Main points of discussion

Cited by 297 publications

References 71 publications

Numerical Simulation of Oil Dispersions in Vertical Pipe Flow

Numerical Simulation of Oil Dispersions in Vertical Pipe Flow

Modified airlift reactor with a cross-shaped internal and its hydrodynamic simulation by computational fluid dynamic method

Investigation of hydrodynamics and transition regime in an internal loop airlift reactor using CFD

Contact Info

Product

Resources

About